2 post mirror

I guess I was thinking of safety when changing lanes on the highway, but realistically, how many times will I be on the highway, to a car show maybe. The car didn't come with one, I may just leave it off as well.
I drive my car all the time, but I know how to turn my head to see what's next to me. I have a crappy hole so mine vibrates loose, otherwise it's on. If you're into stock, more points for not having it.